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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QSGRHIDISTANCEFIELDGLYPHCACHE_H
#define QSGRHIDISTANCEFIELDGLYPHCACHE_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qsgadaptationlayer_p.h"
#include <private/qsgareaallocator_p.h>
#include <rhi/qrhi.h>
QT_BEGIN_NAMESPACE
class QSGDefaultRenderContext;
class Q_QUICK_EXPORT QSGRhiDistanceFieldGlyphCache : public QSGDistanceFieldGlyphCache
{
public:
QSGRhiDistanceFieldGlyphCache(QSGDefaultRenderContext *rc, const QRawFont &font, int renderTypeQuality);
virtual ~QSGRhiDistanceFieldGlyphCache();
void requestGlyphs(const QSet<glyph_t> &glyphs) override;
void storeGlyphs(const QList<QDistanceField> &glyphs) override;
void referenceGlyphs(const QSet<glyph_t> &glyphs) override;
void releaseGlyphs(const QSet<glyph_t> &glyphs) override;
bool useTextureResizeWorkaround() const;
bool createFullSizeTextures() const;
bool isActive() const override;
int maxTextureSize() const;
void setMaxTextureCount(int max) { m_maxTextureCount = max; }
int maxTextureCount() const { return m_maxTextureCount; }
void commitResourceUpdates(QRhiResourceUpdateBatch *mergeInto);
bool eightBitFormatIsAlphaSwizzled() const override;
bool screenSpaceDerivativesSupported() const override;
#if defined(QSG_DISTANCEFIELD_CACHE_DEBUG)
void saveTexture(QRhiTexture *texture, const QString &nameBase) const override;
#endif
private:
bool loadPregeneratedCache(const QRawFont &font);
struct TextureInfo {
QRhiTexture *texture;
QSize size;
QRect allocatedArea;
QDistanceField image;
int padding = -1;
QVarLengthArray<QRhiTextureUploadEntry, 16> uploads;
TextureInfo(const QRect &preallocRect = QRect()) : texture(nullptr), allocatedArea(preallocRect) { }
};
void createTexture(TextureInfo *texInfo, int width, int height, const void *pixels);
void createTexture(TextureInfo *texInfo, int width, int height);
void resizeTexture(TextureInfo *texInfo, int width, int height);
TextureInfo *textureInfo(int index)
{
for (int i = m_textures.size(); i <= index; ++i) {
if (createFullSizeTextures())
m_textures.append(QRect(0, 0, maxTextureSize(), maxTextureSize()));
else
m_textures.append(TextureInfo());
}
return &m_textures[index];
}
QSGDefaultRenderContext *m_rc;
QRhi *m_rhi;
mutable int m_maxTextureSize = 0;
int m_maxTextureCount = 3;
QSGAreaAllocator *m_areaAllocator = nullptr;
QList<TextureInfo> m_textures;
QHash<glyph_t, TextureInfo *> m_glyphsTexture;
QSet<glyph_t> m_unusedGlyphs;
QSet<glyph_t> m_referencedGlyphs;
QSet<QRhiTexture *> m_pendingDispose;
};
QT_END_NAMESPACE
#endif // QSGRHIDISTANCEFIELDGLYPHCACHE_H
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